The Greenbrier is a resort located about 400km south of Washington DC in the mountains of West Virginia. During the Cold War the United States government maintained a top-secret underground bunker here intended to house the members of the House of Representatives and the Senate in case of nuclear war.

This facility was built with the code name Project Greek Island. The Greenbrier happened to be extending its guest facilities and was constructing the West Virginia wing for their diagnostic clinic. The bunker was built directly underneath this wing at the same time, covered the secrecy.

The 12 to 15 government employees responsible for the maintenance and operation of the bunker, worked down here under the cover of Forsythe Associates. They spent only about 20% of their time working for the hotel and about 80% in maintaining the bunker.